CVE-2026-92491 firmware: arm_scmi: Roll back partial protocol table registration
A use-after-free vulnerability in the Linux kernel SCMI driver allows local attackers to execute arbitrary code or escalate privileges via a failed module load.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92491?
CVE-2026-92491 is an use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
firmware: arm_scmi: Roll back partial protocol table registration
scmi_protocol_table_register() can leave earlier requests registered when a later entry in the same ID table fails. Each request retains a pointer to the driver's ID table, so a failed module load can leave a dangling pointer after the module storage is released.
Unrequest only the successfully registered prefix, in reverse order, before returning the failure. Leave the failed entry and the remaining entries untouched because matching requests can be owned by another driver.
Which versions are affected by CVE-2026-92491?
How do I fix CVE-2026-92491?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-92491 being exploited?
There is no known exploitation of CVE-2026-92491 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-92491, DEBIAN-CVE-2026-92491, GHSA-hcj6-qcrw-498h, UBUNTU-CVE-2026-92491.